Die casting die



Oct. 15, 1940. D. MARINSKY ET AL DIE CASTING DIE Original Filed July 16, 1937 INVENTORS Lou/s Mom/v BY zJ/lv/s MAM/5K) ATTORN Y Patented Oct. 15, 1940 UNITED STATES 2,218,091 DIE CASTING DIE Davis Marinsky and Louis H. Morin, Bronx, N. Y.,

assignors to New York, N.

Original application July Whitehall Patents Y., a corporation of New York Corporation,

16, 1937, Serial No.

158,962. Divided and this application November 17, 1937, Serial No. 175,039

4 Claims,

This invention relates to separable fasteners employing stringers with coupling links or scoops arranged on adjacent, preferably beaded, edges of stringers together; and the obJect of the invention is to provide a stringer for fasteners of the class described wherein the links or scoops applied to each stringer are made of two different forms of construction arranged alternately on the stringer, one of the groups of links having the female socket portion formed initially in closed boundary walls and the others with an open boundary wall; a further object being to provide a new method of forming the two different series of links on each stringer which consists in die casting, in one die casting operation, one link of each group so that a pair of links are cast simultaneously on the stringer tape in spaced relation to each other in a single casting operation; a further object being to provide a method as set forth wherein the core forming the female socket of one link is pulled vertically or transversely with respect to the longitudinal plane of the die parts and the core of the other companion link is pulled horizontally or longitudinally with respect to the die parts, the latter forming the socket normally opening outwardly through one side edge of the resulting link or scoop; a further object being to provide means in the form of dies and cores for producing simultaneously, or in one die casting operation, two castings in spaced impressions or mold cavities between adjacent surfaces of die parts or in pairs of die parts, in which latter event independent pressures may be applied to the retion of substantially flare-proof castings; further object being to provide a cast link having a normally open socket which link is so formed as to close the opening of the socket through one side wall of the link; and with these and other objects in view, the invention consists in a device of the class and for the purpose specified, constructed in accordance with the method and by the dies employed as more fully hereinafter described and claimed.

This invention constitutes a division of our prior application Serial No. 153,962, filed July 16,

and is fully disclosed in the following specification, of which the accompanying drawing forms a part, in which the separate parts of our improvement are designated by suitable reference characters in each of the views, and in which:

Fig. l is a perspective View of the separate stringers of a fastener, showing said stringers detached.

Fig. 2 is a perspective view of one part of a die employed in forming a device as shown in Figs. 1 and 2. *5

Fig. 3 is a partial section on the line 4-4 of Fig. 3, taken through the adjacent surfaces of both die parts which are employed. I

Fig. 4 is a perspective view of a modified form of one of the links shown in Fig. 2.

Fig. 5 is a view similar to Fig. 4, showing the step in completing the formation of the link shown in Fig. 4.

Fig. 6 is a view similar to Fig. 3, showing a modification wherein the die parts are formed of two pairs of parts rather than the single parts as in Figs. 3 and 4; and, Fig. 7 is a diagrammatic and broken view showing the dies of Fig. 6 with' a partial longitudinal section through the core portions of the dies.

In the manufacture of die cast separable fasteners made from suitable die cast metals and/or thermoplastic materials, it has been the practice to die cast individual links in a successive series of casting operations on spaced intervals of a separable fastener stringer. This is taught, for example, in Patents 1,975,966 and 2,041,848. It is the purpose of our present invention to increase the speed of production of die cast separable fasteners by providing dies of novel construction wherein twodiiierent types of castings are formed in a single casting operation, upon spaced sec tions or parts of a tape disposed between adjacent surfaces of the dies; or in other words, on the parting line thereof. This is accomplished by forming one cast link arranged in opposite directions as clearly illustrated in Fig. 2 of the drawing. It isalso possible to close the openings in 5,5

the side walls of the links in the manner taught in Figs. 5 and 6 of the drawing so that the resulting fastener would be equivalent in all respects to fasteners of the conventional construction.

In Fig. 1 of the drawing we have indicated at l0 and H, portions of the stringers of a separable fastener which stringers are preferably provided with enlarged or beaded edges Illa, I la, to which are attached the die cast links l2, l2a, l3, l3a. In the construction shown in Figs. 1 and 2, the links l2, |2a, are of the conventional closed type; that is to say, are provided with female coupling portions or sockets M which open only through one surface of the links, said links having projections l5 on the opposite surfaces for entering the sockets of the links of opposed stringers. The links l3, |3a have sockets |6 which open not only through one surface of the link, but also through one side wall thereof as clearly seen at iBa.

At this time, it will be apparent that the links I2, l2a, l3, l3a, may be of any desired size, style, or contour, and may be made of any suitable die cast material. The shape and contour of the coupling elements may be modified within such degrees as will permit of the formation thereof in accordance with the teachings herein defined.

In Figs. 4 and 5 of the drawing, we have shown at H, a modified form of link, l3, l3a, wherein one side wall I8 of the link, the side wall through which the socket l9 opens, is fashioned to provide a pair of projecting members 20, adjacentsurfaces of which are continuous with opposed side walls of the socket I9. The members 20 may be turned inwardly to close the opening of the socket l9, through the wall l8, as indicated at 29a, in Fig. 5 At this time, it will be well to note that if the link is made of thermoplastic material, the members 20 may be cemented together where they abut as at 26a in Fig. 5 of the draw- In forming fasteners of the kind under consideration, one of the links |2--|2a, and one of the links |3--|3a, are formed simultaneously upon the stringer tape or the beaded edge thereof, by the use of a novel type of die construction, one end portion of one part 2| of which is shown in perspective in Fig. 2 of the drawing; whereas the end portion of the other part 22 is indicated in section in Fig. 3 of the drawing. Adjacent surfaces of the die parts are provided with mold cavities 23 and 24 of a contour defining the contour of the links, l2, l3, respectively, to be formed when the dies are brought into abutting relation with each other with the tape therebetween, the beaded edge being disposed in recesses 25, formed in adjacent surfaces of the die parts. A recess 25 is also formed between the die parts and opens into the cavity 23 through the upper surface of the die parts to receive a core pin 21, the lower end 28 or which forms the recess or socket l6, in the links |2--|2a. The cavity 24 differs from the cavity 23 in that the recess 26 is omitted but substituted therefore the die part 2|, in the construction shown, is provided with an inwardly projecting core pin portion 29 which forms the recess H5 in the links |3-|3a.

Opening through one side surface of the dies on the parting line thereof is an admission passage or gate 30 into which suitable die casting material from a heated nozzle or cylinder 3|, partially shown in Fig. 2 of the drawing, may be injected under pressure into the cavities 23, 24 through diverging branches 30a of the opening or gate 30. The branches 30a are also arranged on the parting line of the die parts so that after the castings have been formed in the cavities or impressions 23, 24, the dies may be separated and the two resulting castings, including the gate portions formed in the gate passages 32, may be collectively moved downwardly and the uppermost casting stripped from the core 21 after which this core is returned to its raised position and then moved between the dies in again closing the same in the next successive casting operation in which another pair of castings, |2-|3, l2a--l 3a, are formed. At this time, it will be understood that the gates may be trimmed from the castings in the usual or known manners. The dies are provided with water circulating passages, which extend to points adjacent the impressions in the die parts, to cool the castings in order to insure a high rate of production of the fastener stringers in question.

In Fig. 6 of the drawing, we have shown a slight modifiaction of the structure shown in Fig. 4, to illustrate that the die parts may be severed longitudinally to divide the same into independent sections or pairs of die parts as is indicated by the line 34 in Figs. 6 and '7 of the drawing, which will divide the die part, for example, the part 2|, into independent sections or members 2|a, 2|b; the section 2|a containing the cavity or impression 23a, equivalent to the impression 23, whereas the section 2 lb has the cavity or impression 24a, similar to the impression 24. The other companion die part 22, or in other words, the independent sections or members 22a and 22?) thereof, is indicated in Fig. 7 of the drawing and has on the surface adjacent the members 2 la, 2 lb, the recess forming the complete cavities 23a, 24a. In other words, 2|a, 22a, constitute one pair of die parts and 2|b and 22b constitute another pair of die parts.

The purpose of this construction is to permit the application of independent pressures on the separate sections 2|a, 22a, and 2|b, 221), so that if any slight variation should prevail in the structure of the stringer tape or the beaded edge thereof, this slight or minute variation will be compensated for by the independent pressures applied tothe sections 2 la, 2 H), in the operation of moving the position. This will insure a more perfect seal of the dies around the tape and avoid the possibility of flare of the casting material, not only around the tape but at the other parting line edges of the resulting cast- It will, of course, be understood that at no time would there be any appreciable differential between the two die sections 2|a, 22a, 2|b, 22b, which would cause any difliculty with respect to the admission of the casting material through the nozzle 3|a. However, it is also possible to construct the upper section 2 la to include, as an integral part thereof, the portion designated at 2 |c which would abut the part 2|b on the dot-dash line 2|0l; as noted in Fig. 6 of the drawing in which event the admission opening or gate passage 30b would be formed only in the part Ma and its associated or opposed part 22a, and not in the part 2|b or its associated and opposed part 22b.

Aside from the structural differences above outlined, the method of forming dual castings with the structure shown in Figs. 6 and '7 will be the same as in the steps of the method as disclosed in conjunction with the dies shown in Figs. 2 and 3 of the drawing. With respect to the structure shown in Figs. 4 and 5, it will be understood that the step of turning the member 20 inwardly from the position shown in Fig. 4 to that shown in Fig. 5, will be performed either in a suitable press when metallic castings are formed or softening the material and then reshaping the same in the event that the links are formed from thermoplastic or similar material.

In forming thermoplastic die castings, it will be understood that the stringer tapes, or at least the beaded treated witha suitable material, such for example as acetone, to more securely attach the thermoplastic links to the stringers or beaded edge portions thereof; especially when the links are constructed of cellulose acetate.

While our invention has been specifically illustrated in the formation of die castings of predetermined type and kind and used for a specific purpose, it will be apparent that the fundamental principles of our invention may be utilized in the simultaneous formation of different die castings on a single mounting member, especially wherein different types of cores are employed and moved in different directions as in the present disclosure. As a matter of fact, it is within the spirit of our invention to form within relatively movable dies or pairs of dies, two or more independent and complete die castings in a single injection of casting material under pressure into the cavities or impressions of the dies. It will also be understood that any arrangement of the different links may be provided on the mounting member.

Having fully described our invention, what we claim as new and desire to secure by Letters Patent, is: r

1. In the manufacture of a series of die cast elements on a mounting member, a die comprising parts movable toward and from each other, abutting surfaces of said parts having spaced dissimilar mold cavities, said surfaces having recesses registering with said cavities to receive a mounting member, a core pin movably arranged between said die parts and extending into one of said cavities only and so arranged as to form a means to eject said series of die cast elements from the die upon opening thereof, means on said surfaces of the die parts for directing heated casting material simultaneously into said mold cavities from a single source of supply in forming the series of dissimilar castings on said member.

2. In the manufacture of a series of die cast elements on a mounting member, a die comprising parts movable toward and from each other, abutting surfaces of said parts having spaced dissimilar mold cavities, said surf-aces having recesses registering with said cavities to receive a mounting member, a core pin movably arranged between said die parts and extending into one of said cavities only. and so arranged as to form a means to ejectsaid series of die cast elements from the die upon opening thereof, means on said surfaces of the die parts for directing heated casting material simultaneously into said mold' edge portions thereof, may be first cavities from a single source of supply in forming the series of dissimilar castings on said member, another core element integral with one die part and extending into another of said cavities and removable from the casting formed in the last mentioned cavity in the separation or opening of the dies.

3. In the manufacture of pairs of die castings, a die unit composed of two pairs of die memers arranged one upon the other in abutting relation, each pair of die members having on adjacent abutting surfaces thereof a mold cavity in which one die casting is formed, said surfaces of the pairs of die members having admission passages leading from one end of each impression to a single orifice o ening through one'side of the pairs of die members whereby, casting material may be injected under pressure simultaneously into the mold cavities of both pairs of dies in simultaneously forming said two castings, means applying independent pressure to each pair of die members to maintain firm engagement with each other to independently seal the mold cavities, a movable core pin arranged on the parting line of at least one pair of die membersand extending into the mold cavity thereof whereby the casting formed in said cavity will be arranged on said core pin, and said pin forming means to eject the castings from the cavities of both pairs of die members and to move the same from the die members upon opening thereof.

4. In the manufacture of pairs of die castings, a die unit composed of two pairs of die members arranged one upon the other in abutting relation, each pair of die members having on adjacent abutting surfaces thereof a mold cavity in which one die casting is formed, said surfaces of the pairs of die members having admission passages leading from one end of each impression to a single orifice opening through one side of the pairs to die members whereby casting material may be injected under pressure simultaneusly into the mold cavities of both pairs of. dies in simultaneously forming said two castings, means applying independent pressure to each pair of die members to maintain firm engagement with each other to independently seal the mold cavities, a movable core pin arranged on the parting line of at least one pair of die members and extending into the mold cavity thereof whereby the casting formed in said cavity will be arranged on said core pin, said pin forming means to eject the castings from the cavities of both pairs of die members and to move the same from the die members upon opening thereof, and adjacent surfaces of the pairs of die members having grooves extending between the cavities and through outer surfaces of both pairs of die members to receive a mounting member upon which both castings are simultaneously formed.

DAVIS MARINSKY. LOUIS H. MORIN. 

